A flexible shaft includes a flexible, elongated outer sheath, at least one drive shaft disposed within the outer sheath and a moisture sensor disposed within the outer sheath configured to detect moisture within the outer sheath. Another flexible shaft includes a flexible, elongated outer sheath, at...http://www.google.se/patents/US20040111081?utm_source=gb-gplus-sharePatent US20040111081 - Electro-mechanical surgical device
